Thanks for all the replies, guys. I went ahead and did some more tumbling and disassembling more parts and what not. Does anyone know how to take the back housing completely off the smog pump? Do I have to remove the front 3 bolts that hold the plate on underneath the pulley mounting flange, or does the flange come out first, and then the entire assembly gets pressed out? I would like to have the pump housing tumbled when i bring the valve cover and timing cover to the large tumbling facility so that the housing looks brand new. as it looks like it's seen better days. I am hoping to plate the entire back housing if it's possible so that i can then tape off the plated tubes/elbows and give it a quick coat of black or cast iron. looks like it was black phosphate coated before the tubes were pressed in, but I don't find it economical to do anything like that. It will still be under the minimum charge for the items I am taking to tumble, so I might as well have at it. In other news, I found that Meguires HOT SHINE tire shine is my new tumbler solution of choice for plastic pyramid media, with about a cup and a half of water... and for the dry shine media- a couple of table spoons of CLEAR (not "natural") furniture/floor/wood wax heated up until liquid and dropped into the dry shine media really brings out the lustre on old and new items alike. You just gotta let it run through for an hour before tumbling the actual parts so the dry corn cob media soaks up the wax and breaks down the clumps evenly. I will be posting photos as soon as I get the next stuff back from the plater and the tumbler place. the anti-backfire valve came out brand new, as well as the fuel pump. But I would like to remove the pivot pin from the fuel pump arm so that I can run it through the dry shine media to brighten it up a touch to match the carb hats and valve cover, so I think I just have to heat up the housing a little bit and press the steel pin all the way through one side. Should be relatively simple. The replacement pump I was given was not for a 240z head, the bolt pattern is different.